You ever think about making the mostly constructive version of this algorithm (rather than having the add and remove phases)? Let's say you have a page with li

You ever think about making the mostly constructive version of this algorithm (rather than having the add and remove phases)? Let's say you have a page with links in headers and paragraphs. You want to select some subset of links. Rather than having the first click on a header link isolate "a", you could have the first click isolate "h2 a". Then you could construct the set of all links by adding paragraph links via a second click. This seems easier to reason about.